config: command-line revamp

modules/common/shell/direnv.nix

@@ -0,0 +1,44 @@
+{ lib, ... }: {
+  home-manager.sharedModules = [
+    (homeArgs: let
+      direnv = lib.getExe homeArgs.config.programs.direnv.package;
+    in {
+      programs.direnv = {
+        enable = true;
+        nix-direnv.enable = true;
+        enableNushellIntegration = false;
+      };
+
+      programs.nushell.extraConfig = lib.mkAfter /* nu */ ''
+        $env.config = ($env.config? | default {})
+        $env.config.hooks = ($env.config.hooks? | default {})
+        $env.config.hooks.pre_prompt = (
+            $env.config.hooks.pre_prompt?
+            | default []
+            | append {||
+                ${direnv} export json
+                | from json --strict
+                | default {}
+                | items {|key, value|
+                    let value = do (
+                        {
+                          "PATH": {
+                            from_string: {|s| $s | split row (char esep) | path expand --no-symlink }
+                            to_string: {|v| $v | path expand --no-symlink | str join (char esep) }
+                          }
+                        }
+                        | merge ($env.ENV_CONVERSIONS? | default {})
+                        | get -o $key
+                        | get -o from_string
+                        | if ($in | is-empty) { {|x| $x} } else { $in }
+                    ) $value
+                    return [ $key $value ]
+                }
+                | into record
+                | load-env
+            }
+        )
+      '';
+    })
+  ];
+}